[Merge] pdbq:pkg-bug-set-milestones into pdbq:main

[Andreas Hasenack]

When the task doesn't exist, it sets the milestone to the single/main/devel task instead. I was expecting an error:

$ ./scripts/pkg-bug set-milestone lp:2061726/ubuntu/noble/rsyslog ubuntu-24.04.2
Successfully set milestone to ubuntu-24.04.2

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https://code.launchpad.net/~bryce/pdbq/+git/pdbq/+merge/480062
Your team Ubuntu Server Developers is requested to review the proposed merge of pdbq:pkg-bug-set-milestones into pdbq:main.